Extension barrel, fixed length, with consistent threads on both ends, used to extend the flange distance of the lens Matting treatment on inner wall to reduce stray light caused by surface reflection of structural parts

Extension barrel, fixed length, with consistent threads on both ends, used to extend the flange distance of the lens Matting treatment on inner wall to reduce stray light caused by surface reflection of structural parts

The working distance of the lens has a certain range, so it cannot focus clearly at any object distance When the working distance is less than the minimum working distance of the lens, the extension ring can make the lens focus clearly Extension ring has 0.5mm, 1mm, 2mm, 5mm, 10mm, 20mm, 40mm